feat: enhance keyboard actions/help modal

[midzelis]

Refactor shortcuts to use new {@attach} syntax and enhance shortcuts handling:

• Cleaner syntax with fewer nested objects
• Better ergonomics with union type support and helper functions
• Integrated help system with automatic modal registration
• Scoping support for hierarchical shortcut management
• Categorization for better organization
• Variant pairing for related shortcuts
• Platform awareness for displaying appropriate key symbols

[github-actions]

Deploying preview environment to https://pr-22689.preview.internal.immich.cloud/

[alextran1502]

Thanks, Min, for the nice PR, I did some testing and have some feedback

1. When on the /photos route, pressing ctrl + t will open the tag model AND switch the light/dark mode
2. In dark mode, the key combination doesn't have a background,

3. While on the timeline, pressing action such as "Shift + A" will still trigger the archive action, is this expected?

Other than that, great work! When you are done addressing the issue above, I can help with some minor styling tweaks